Underwater rock boring apparatus having differential global positioning system receiver and boring method thereof

Abstract

The present invention relates to an underwater rock boring apparatus having differential global positioning system receiver and boring method thereof, new boring technology—a satellite navigation device orients the accurate position of a target—is brought to the underwater boring technology. A differential global positioning system (DGPS) receiver is provided at the body of a boring machine that is installed at the central opening of a self elevation platform (SEP) barge, the location of the boring machine is set to concentricity of the target boring position, and the position of the hull can be controlled without any movement of the boring machine. Then, the barge quickly moves to the next target boring location owing to the operation of a hull moving means so that the construction efficiency of the boring work can be enhanced.

1. An underwater rock boring apparatus having a differential global positioning system receiver comprising:
 a boring machine installed at the upper portion of an opening in a barge hull, and having a differential global positioning system (DGPS) receiver at a predetermined location of the body thereof; 
 a differential global positioning system (DGPS) in which the DGPS receiver attached on the boring machine which receives location data from a satellite and a reference station and sends the received data to a control means through a cable; 
 a boring data memory means for storing a boring map that displays both boring target location of an underwater rock and boring location data that are entered through an input means; 
 wherein the input means receives the boring target location data of the underwater rock and integrates the location data of the boring machine with the boring target location data; 
 a display means that respectively displays the location of the boring machine and the boring target location of an underwater rock and monitors the entire procedure; 
 a hull moving means for controlling a location of the barge hull; and 
 a controller for controlling a response to the boring target location data received from the boring data memory means and the boring machine location data received from the DGPS, the operation of the hull moving means and the data received by the input means. 
 
   
   
     2. The underwater rock boring apparatus having a differential global positioning system receiver according to  claim 1 , in which the DGPS receiver is attached at the upper part of the boring machine that is coaxial to the rod of the boring machine. 
   
   
     3. The underwater rock boring apparatus having a differential global positioning system receiver according to  claim 1 , in which the hull moving means comprises plural winches that are installed on the barge; a winch driver for driving plural winches under command of the controller; and plural wire ropes that are wound on respective winches, and are connected to respective anchors dropped on an underwater rock via direction diverters that are respectively installed at four corners of the barge. 
   
   
     4. The underwater rock boring apparatus having a differential global positioning system receiver according to  claim 3 , in which the winch driver operates a forward and a reverse rotation and a stop by the operation of each winch under command of the controller. 
   
   
     5. The underwater rock boring apparatus having a differential global positioning system receiver according to  claim 1 , in which the hull moving means is driven under command of the controller, and winches placed in the same direction as the hull moving direction run to pull the wire rope, and winches placed in the opposite direction to the hull moving direction run to release the wire rope. 
   
   
     6. The underwater rock boring apparatus having a differential global positioning system receiver according to  claim 1 , in which the input means is a scanner or a keyboard. 
   
   
     7. A boring method using an underwater rock boring apparatus having a differential global positioning system (DGPS) receiver comprising:
 a) an initializing set-up step comprising the substeps of:
 moving a barge that has the boring machine with the DGPS receiver on the center of the barge above the rock to be bored; 
 anchoring the barge by operating plural winches and plural wire ropes to drop the anchors on the rock that is far away from the hull at a predetermined distance to stop the barge; 
 the controller receiving the present position data of the barge from the DGPS; 
 establishing on the display means the XY plane with the origin of the present position; 
 storing the boring map and the boring data in the boring data memory means to display the target boring position of the underwater rock on the display means; 
 
 b) displaying the target boring position oriented from the boring data memory means and the position of the boring machine inputted from the DGPS on the display means with the XY plane; 
 c) determining whether or not the position of the target boring corresponds with the position of the boring machine; 
 d) when the position of the boring machine does not correspond with the position of the target boring, the controller driving the winch driver to move the hull; 
 e) when the position of the boring machine does correspond with the target boring position, lowering the rod and the bit of the boring machine through the opening of the barge and boring the underwater rock; 
 f) when the rock boring work for the target boring position is completed, moving the hull to the next target boring position; and wherein the above steps b)˜f) are repeatedly performed. 
 
   
   
     8. The boring method using an underwater rock boring apparatus having a differential global positioning system receiver according to  claim 7 , wherein the hull location control step (d) and the hull movement step (f) include the following substeps:
 the controller operating the winch driver; 
 providing plural wire ropes wound on each winch are connected to respective anchors through the direction switch guider; 
 winding the wire rope installed to move in a predetermined direction; and 
 releasing the wire rope installed to move in the opposite direction, thereby achieving the movement of the hull.